Bug fix: -as mkisofs -no-emul-boot without -boot-load-size defaulted to size 4

xorriso/base_obj.c

@@ -266,6 +266,8 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  m->boot_image_emul= 0;
  m->boot_emul_default= 1;
  m->boot_image_load_size= 4 * 512;     /* hearsay out of libisofs/demo/iso.c */
+ m->boot_img_size_default= 1;
+ m->boot_img_full_size= 0;
  memset(m->boot_id_string, 0, sizeof(m->boot_id_string));
  memset(m->boot_selection_crit, 0, sizeof(m->boot_selection_crit));